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GEMOLOGYHURLBUT CS JR; SWITZER GS.1979; USA/ENG/AUS/CAN; NEW YORK, CHICHESTER, BRISBANE, TORONTO. J. WILEY; DA. 1979; XII-243 P.; 24 CM; H.T. 12; BIBL. DISSEM.; 268 ILL.; ISBN 0 471 42224 XBook